The ionized nebula surrounding the red supergiant W26 in Westerlund 1DOI: info:10.1093/mnrasl/slt127v. 437L1–L5
Wright, Nicholas J., Wesson, Roger, Drew, Janet E., Barentsen, Geert, Barlow, Michael J., Walsh, Jeremy R., Zijlstra, Albert, Drake, Jeremy J., Eislöffel, Jochen, and Farnhill, Hywel J. 2014. "The ionized nebula surrounding the red supergiant W26 in Westerlund 1." Monthly Notices of the Royal Astronomical Society, 437 L1–L5. https://doi.org/10.1093/mnrasl/slt127.